Magnetic clutch control means for coaster brakes



Oct. 31, 1950 T. K. cRossLAND 2,528,039

MAGNETIC CLUTCH CONTROL MEANS FOR COASTER BRAKES Filed March 21, 1947 E @im i mi mnannn.

INVENTOR. 7775050516 A. fraSA/VE @www Patented ct. 31,

2,528,039'V n' y MAGNETIC CLUTCH CONTROL MEANS CoAS'rER BRAKES r Theodore K. Crossland, Hialeah, Fla.. ,f Application March 21, 1947, Serial No. 736,298

1 Claim.. (C1. 19a-6) -This linvention relates to a coaster brakeyand has for one of its objects the production of a simple and eiiicient means forholding the clutch member of aco'aster brake'against turning movement relative to the supporting axle when the clutch member is in an intermediate `position re1ativeto the driving meansV and-the brake-applying means'o'f the coaster brake.

A further object -of'fthis invention is the production of` an eicient magnetic means for holdingfthe clutch memberof a coaster brake against turning movement or rotation relative to its supporting axle when the clutch member is in an intermediate positionv relative to the driving means and the brake-applying means of a coaster brake.

Other objects and advantages of the present invention will appear throughout the following specification and claim.

In the drawing:

- Figure 1 is a longitudinal sectional view of the coaster brake;

Figure 2 is an irregular sectional view taken on line 2-2 of Figure 1; y

Figure 3- is an enlarged sectional view taken 'on line 3 3 'of Figure l, illustrating the lines of magnetic flux applied to one form of the invention;

Figure 4 is a fragmentary longitudinal Sectional view illustrating a modified form of the invention;

Figure 5 is an enlarged Sectional view taken onjr line 5--5 of Figure 4 illustrating the lines of magnetic flux as applied to the form of invention shown in Figure 3;

Figure 6 is a fragmentary longitudinal sectional view illustrating afurther modified form of the invention;

Figure '7 is an enlarged sectional view taken on line 'I-I of Figure 6 illustratingwthe lines of magnetic ux as applied to the form of invention shown in Figure 6;

Figure 8 is an end elevational view reduced in size of the fixed brake shoe supporting member.

This application constitutes a continuation in part of my previous application relating to a` Coaster Brake, filedA December 31, 1946, Patent Number 2,493,227, and relates more specifically to the magnetic means for holding the clutch member against turning movement upon its supporting axle while the clutch member is in an intermediate non-engaging position relative to the drivingy means and the driven means oi the coaster brake. will be Seen that I0 designates the wheel hub or By referring to the drawing, itA

Vspoolwhich is rotatably 'supported at one end upon the bearings II, which bearings are car@ ried bythe race I2 of the xed brake shoe supporting member I3. The member I3 is preferably threaded upon the shaft or axle I4, as kshown inFigure l. The member I3 is lprovided with an inwardlyextending core I5 which is substantially rectangular in its transverse area, as Shown in Figure-2. A pair of brake shoes I6 are carried bythe core I5 and are adapted to expand radially of the'member I3. A suitable split spring band Il fitting in the channels I8 of the shoes IB holds the shoes normally contracted. The member I3 is provided with a Wedgeeshaped lug I9 upon each Side of the core I5, as Shown in Figure 8, for contacting the shoes I6 and causing the shoes I6to expand as the wedge-shaped lugs 20 of the brake wedge disc 2I engages vthe beveled'face's 220i the lbrake shoes I6. The disc 2| is slidable toward and away'from'the Shoes I5 to move the lugs 20 Ainto and out of a brake rshoe actuating position, and to move the shoes into engagement with theinner face of the hub or spool I0. The opposite face of the disc 2l is preferably serrated for Contact withthe disc 26 which is preferably similarly serrated upon its abutting'face which contacts* the disc" ZI-See Figure 1.

l9vAfbearingcon'e 23 is iixed on the shaft or `axle I4, by'being threaded thereon and locked by Suitableset screw v24 shown in dotted lines in"` Figure 1. The cone 23 supports the bearings 25 which 1n turn rotatably support the hub I0 near the opposite end relative to the bearings I I above mentioned. The disc 2B is slidable on the shaft or axle yIll and is carried by the inner ends of the pins 28, which pins are slidable through the bearing cone23. The opposite ends of the pins,

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28 are secured to the clutch-disc 29. The disc 29 isprovided with a serratedface 3U, which iace3v0; is adapted to be contacted by the serrated face 3| of the worm nut or floating clutch member 32.

The Worm nut or clutch member 32 is threaded upon the worm thread 33, carried by the hub extension of the driving sprocket 34 for longitudi-A nal movement thereon.i This worm nut or clutch member 32 is magnetized, as set forth in detail in the vfollowing description, and thereby eliminates the conventional Spring. The driving sprocket 34 is carried by the bearing nut 35 which is.,v

threaded rupon the axle I4 and suitable ballbearings 36k are interposed between the driving sprocket 34 and thel nut 35, to support the sprocket ,134. The adjustable nut 35 is of the conventional type. The hub or Spool Ill kis provided with'an end wall 36 having a central aper' ture 37 which tapers inwardly toward its center and in the direction of the sprocket 34. The clutch member 32 is provided with a tapering or inclined serrated face 38 which is adapted. to provide wedging engagement within the aperture 31 to drive the spool or hub I from the hub extension of the driving sprocket 34 and limit movement of the clutch member in one direction. An anchored disc 39 is fitted to the shaft or axle I4 by a set vscrew 39a, and ts within the clutch member 32, as shown in Figure 1, and for the purpose described in the following.

It should be noted that as the drive sprocket 34 is driven in one direction the worm thread 33 will draw the clutch member 32 rmly in wedging engagement within the tapering aperture 31 for the purpose of rotating the hub or spool I0. As

the direction of rotation of the sprocket 34 is reversed, the thread 33 will move the clutch member 32 out of engagement with and away from the tapering aperture 3? and into contact with the disc 29, thereby causing the pins 28 to force the disc 26 against the disc 2I. This movement will force the wedges 28 against and between the beveled faces 22 of the brake shoes i6 and spread the brake shoes Iii apart into gripping action vwith the inner face of the hub I0, thereby applying a braking action to the hub or driven member ID. This is substantially the operation and construction set forth in my previous application above identiiied. The present application however, is directed specifically to the magnetic means for holding the clutch member 32 against turning or rotating movement relative to the axle when the clutch member is in an intermediate position relative to the driving means and the brakeapplying means, which position will release the hub I D for free coasting.

In the form shown in Figures l and 2, it will be noted that the clutch member 32 is shifted into gripping engagement with the wheel hub or spool I by the worm thread 33, as the sprocket 34 is rotated in one direction. The clutch member 32 is shifted into a brake shoe applying position by the worm thread 33, as the sprocket 34 is rotated in the opposite direction. Therefore, it is necessary to provide some means to hold the clutch member 32 against turning movement relative to the axle I4 as the thread 33 rotates to shift the clutch member 32 in order to insure longitudinal shifting movement of the clutch member 32 in selected opposite directions longitudinally of the axle I4. I have provided a very simple means for accomplishing this function by eliminating the conventional spring means and substituting therefor a magnetic means to hold the clutch member against turning movement when the clutch member is in an intermediate position and when the hub I0 is in a free coasting position. The clutch member 32 is provided with longitudinally extending slots which slots are formed to extend inwardly from the serrated face 3| thereof. These slots 40 are preferably. arranged diametrically opposite each other, as shown in Figure 2. The areas of the clutch 32 upon opposite sides of the slots 40 aie magnetized and the magnetic lines of force or the iiux will extend inwardly toward the-disc 39 from one side of each slot toward the other side thereof in an inwardly curved manner, as shown in Figure 1. This magnetic force will therefore hold the clutch member 32 against turning movement relative to the axle I4 since the disc 39 is anchored to the axle I4. This magnetic force, however, is not suiicient to prevent the clutch member 32 from being shifted longitudinally from one position to the other or to retard this movement as the thread 33 rotates for shifting the clutch member 32 in the manner above described. Where the iield strength of the magnetic force is suiiicient, the disc 39 may be eliminated without departing from the spirit of the invention.

Many variations may be provided to anchor or hold the clutch member against turning movement, two other forms being shown in Figures 4 and 6. In Figure 4, a shaft I4, similar to the shaft I4, is shown. The sprocket wheel 34a carries the threaded hub 35a and the clutch member 32a is shifted into and out of selected engagement with the wheel hub Il)a and the disc 29, which controls the brake-applying mechanism 2Ia, similar to that shown in Figure l. This mechanism 2 Ia is controlled by the pins 28a, which extend through the cone 23a and engage the disc 29a. In Figure 4, a bearing cone 231L of a slightly modified design is shown and the disc 29a isv arranged to iit within the clutch member 328. The cone 23a is anchored to the shaft I4Y by means of a pin 24a. Suitable serrations are provided upon the disc 29a and the clutch 32a, as shown. The disc 29a, however, in this form is provided with a split portion 4I. This disc 29@- is magnetized adjacent the split portion 4I, and the lines of magnetic force or flux are outwardly curved in a direction across the split portion 4I and against the inner face of the clutch member 32a, as shown in detail in Figure 5.

In Figure 6, there is shown a further form of the invention, whereby the bearing cone 23b is provided with an overhanging portion 42 which overhangs the clutch member 32,b at all times. A magnetized threaded plug 43 extends transversely through the overhanging portion 42, as shown in Figures 6 and '7. The lines of magnetic force in this instance extend inwardly or in an inwardly curved direction toward the clutch member 321U from the plug 43-see Figure 7. Since the bearing cone 23b is anchored to the axle I4b by the pin 24b the clutch member 32b cannot turn upon the axle IIIb while the clutch member is being shifted from one position to the other.

It should be understood that many variations may be made to accomplish the desired result by means of the use of magnetic force to anchor the clutch member against rotation when in an intermediate position, without departing from the spirit of the invention so longy asY these changes fall within the scope of the appended claim.

Having described the invention, what claimed as new is:

A coaster brake ofthe class described comprising a fixed axle, a hub rotatably mounted thereon, a drive sprocket mounted at one end of the hub for rotation relative to the hub and axle, a drive member on the axle and fixed to the sprocket, a hollow floating clutch member threaded upon and surrounding said drive member for longitudinal movement relative thereto in response to relative rotation therebetween, said clutch member having an intermediate free coasting position for said hub, said clutch member having aj longitudinal slotted portion, the area of theI clutch member upon opposite sides of the slotted portion being magnetized, a disc fixed to said axlev and fitted into said hollow noating clutch member, said disc having the periphery thereof in close proximity to Said slotted portion of said clutch member and extendingy in a directiontransversely of the slotted portion, the lines of magnetic force of the magnetized'areas of the clutch extending toward the periphery of said disc in an inwardly curved manner to hold the clutch member against turning movement relative to the axle when the clutch member is in an intermediate position, means to limit the movement of said clutch member in one direction in response to forward turning movement of the sprocket and drive member and to effect clutching engagement between the clutch member and hub to drive the hub by said sprocket, a brake in said hub, and means to actuate said brake by movement of said clutch member in the opposite direction in response to a reverse turning movement of the sprocket and drive member relative to the axle.

THEODORE K. CRO SSLAND.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 681,835 Soldana Sept. 3, 1901 817,305 Duncan Apr. 10, 1906 937,099 Schulze Oct. 19, 1909 1,018,471 Zimmerman Feb. 27, 1912 2,151,324 Jordan Mar. 21, 1939 2,291,486 Musselman July 28, 1942 2,303,041 Glacy Nov. 24, 1942 FOREIGN PATENTS Number Country Date 434,729 France Dec, 5, 1911 

